I would like to wish all the best to everyone at Brentford I had a fantastic 6 years full of great memories which I will never forget— Toumani diagouraga (@toums20) January 22, 2016
Thanks for all the welcoming messages I am looking forward to a new challenge with #lufc can't wait to get started— Toumani diagouraga (@toums20) January 22, 2016
The 28-year-old is one of the better midfielders in the Championship and has been in good form so far this season.
In 27 league games this campaign, the Frenchman has created 14 chances, has a pass accuracy of 86%, and has won 15 headers, 10 dribbles and 28 tackles.
Brentford are 11th in the Championship table at the moment with 36 points from 27 matches. The Bees are nine points behind Sheffield Wednesday, who are currently sixth in the standings and occupy the final playoff spot.
Meanwhile, Leeds currently find themselves 17th in the Championship table with 32 points from 27 games, just eight points above the relegation zone.
The West Yorkshire outfit will take on Bristol City at Elland Road in the league on Saturday afternoon, while Brentford will face Preston North End away from home at Deepdale.